Piston expander



Sept. 7, 1937. W, C' VAN OOR-r 2,092,377

4 PISTON EXPANDER Filed Dec, 51, 1954 'm Il?? l n nLlJlbl Patentedsept?, 1937 Y Y Y2,092,377

UNITED STATES PATENT @FFI CE 27,092,377 Pls'roN EXPANDER Wien C. Vano1t, Orange City, Iowa Application December 31,1934, serial No. 759,845

s Claims. (ol. 309-12) My invention relates to a device for expandingOne end of the ,expander includes the' arcuate a piston of the usualtype employed in reciproportion I which is made in this shape to alloweating internal combustion engines. for contraction and expansion, Aandyet `maintain An object of my invention is to provide a simple therigidity 0f the device 5 and convenient expanding arrangement which Theother end of the expander includes the 5 allows expansion of thepistonto take up the conend portion IE, bent approximately as shown, tractionof the same due to friction. which is threaded at I1 to receive the boltI8.

A further object of my invention is to provide Thebolt I8 is received bythe lock-nut I9.

an exp-ander which is light and which will not The top of the deviceincludes the upwardly Y 10 get out of order. l projecting sides 20 (seeFigures 2 and 4). 10

A further object of my invention is to provide The side walls I3 includethe circular openings an expander which will expand practically the 25,through which passes the usual piston pin 26. entire -length of thepiston so that the seal be- The opening 25 is made sufficiently largerthan tween the piston and the cylinder wall will be the size of the pinto allow for variation when efficiently maintained. the expander is usedwithout interfering with l5 A further object of my invention is toprovide the smooth operation of the pin. an expander which is easy toinstall and which It will be understood that the entire device can alsoprovides means for retaining oil which be made of one pieee 0f Springmaterial S0 that otherwise would be thrown out of the piston sides. theSame een be readily slipped ntO the PSDOII aS A further object of myinvention is to provide a complete unit. 20 the above means in astructure of simplicity In 115e the eXDa'ndel l2 iS DlnCed IlSde 0f thewhich can be manufactured at a very reasonable DSDOH aS Shown in Figures1 and 2 With the upper cost. portion 20 resting against the rib 2l ofthe piston With these and other objects in View, my initself. Thisbrings the extending ears lli upvention consists in the construction,arrange- Wardly against the usual opening 22 (Seo Figure ment andcombination of the various parts of my 2) Wheh Opening iS presentbeWeeIl the pin device, whereby the objects contemplated are bearingsand the sides of the piSlOIl- This DFO- attained, as hereinafter morefully set forth, Vides a Closure means which prevents oil from pointedout in my claims, and illustrated inthe beine thrown outwardly from theinterior of the accompanying drawing, in which: l piston to the pistonwalls, thereby relieving the 30 Figure 1 is a View of a piston includingmy burden of the piston rings in sealing against too expander taken fromthe bottom of the piston, largo a Supply of oil beine thrown up from theFigure 2 is a sectional View of Figure 1 taken Cl'enk CaSe 0f theengine. along the lines 2--2 thereof, After the device is placed in thepiston as ex- Figure 3 is a principal view of the expander plaine@ il?iS eXIJaflded by means 0f the bolt 3 35 itself, and which is turned sothat the end 23 thereof abuts Figure 4 is a sectional View of Figure 3taken against the inside of the piston Wall, forcing the along the lines4--4 thereof. other end I5 against the other inner side. This Many ofthe usual piston expanders now used operation expands the diameter ofthe piston by utilize a structure which will only expand the virtue ofthe usual slot Il so that, when desired, to

skirt or the lower part of the piston. expansion can be achieved, yetmaintaining a per- One of the principal objects of my invention is feetcurvature of the piston.V to provide a structure which will eflicientlyex- As explained the portion l5 being arcuate abpand the entire lengthof the piston. sorbs any `slight variations set up through ex- I haveused the character I0 to designate genpansion, and yet maintains thestructure in its 45 erally the piston of a combustion engine, whichVexpanded condition. piston includes the small slot Il which passes Itwill be understood, of course, that after the practically vertically upalong the side thereof. device is placed inside of the piston that thepin This slot is made to allow for expansion through and connecting rodare assembled as shown genheat of the piston. erally in theillustrations, and which allow the 50 My device comprises the springmetal strucretention of the device so that the expander will ture whichis indicated generally by the characbe in place during the operation ofthe engine. ter I2. This structure is made in one piece and The lock-nutI9 is screwed on tightly against includes the side walls I3 whichterminate in the threaded shoulder 24 to eiciently lock the the upwardlySlOpng flePS Hl Y bolt after the expansion operation is made. 55

It will now be seen that I have provided a piston expander which causesexpansion of the piston along practically the entire length thereof.

It will be seen further that I have provided such a device which is verylight, thereby falling in line With general combustion practice, and itwill be seen that I have provided means associated with the expander toprevent an excess of oil being thrown out through the piston Walls, thatI have provided eicient means for absorbing heat expansion.

It will also be seen that I have provided al1 of the above mentionedmeans in a structure of great simplicity which can be manufactured at avery reasonable cost.

I claim as my invention:

l. A piston expander comprising a shell adapted to be inserted inside apiston, said shell including an arcuate spring portion at one endthereof for absorbing expansion and contraction when the spring portionis compressed against the inner Wall of the piston, the other end of theshell including adjustable pressure means for engaging the oppositeinner wall of the piston.

2. A piston expander comprising a shell adapted to be inserted inside apiston, said shell including an arcuate spring portion at one endthereof for absorbing expansion and contraction when the spring portionis compressed against the inner Wall of the piston, the other end of theshell including adjustable pressure means for engaging the oppositeinner wall of the piston, said pressure means including a boltthreadedly engaged with the said other end of the shell.

3. A piston expander comprising a shell adapted to be inserted inside apiston, said shell including an arcuate spring portion at one endthereof for absorbing expansion and contraction when the spring portionis compressed against the inner Wall of the piston, the other end of theshell including adjustable pressure means for engaging the oppositeinner Wall of the piston, said shell having integral baffle platesformed therewith for covering exposed side openings in the piston.

WIEN C. VAN OORT.

